Machine for milling variable grooves in screw-dies



(No Model.)

' 9 Sheets-Sheet 1. A. URBAN. MACHINE FOR MILLING VARIABLE GROOVES IN SCREW DIES; No. 602,884.

Patented Apr. 26, 1898.

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A. URBAN.

MAGHINB FOR MILLING VARIABLE GBOOVBS IN SCREW DIES.

No. 602,884. Patented Apr. 26, 1898.

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(No Model.) 9 Sheets"Sheet 3 A. URBAN. MA'GHINE FOR MILLING VARIABLE GROOVES IN SCREW DIES.

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A. URBAN.

MACHINE FOR MILLING ARIABLE (moons IN SCREW DIES. No, 602,884. Pate-ntedApr. 26 1898.

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A. URBAN. MACHINE FOR MILLING VARIABLE GROOVBS IN SCREW DIES.

Patented Apr. 26, 1898;

KHZ/755555 (No Model.) 9 Sheets-Sheet 7.

A. URBAN.

MACHINE FOR MILLING VARIABLE GROOVES IN SCREW DIEs.

No. 602,884. Patented Apr. 26, 1898.

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(NoModeL) 9 Sheets-Sheet 8 A. URBAN. MACHINE FOR MILLING VARIABLE'GROOVES IN SCREW DIES. No. 602,884.

Patented Apr. 26, 1898.

(No Model.) 9 SheetsSheet 9.

A. URBAN.

' MACHINE FOR MILLING VARIABLE GROOVES IN SCREW DIES.

, N0. 602,884. Patented Apr. 26, 1898.

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L i E Al A 71-1: NORRIS PETERS c0. moruuwm. WASHiNGTON. n. c

UNITED STATES ANTON URBAN,

RUSSELL d5 ERWIN CONNECTICUT.

PATENT tries.

OF VIENNA, AUSTRIA-HUNGARY, ASSIGNOR TO THE MANUFACTURING COMPANY, OF NElV BRITAIN,

MACHINE FOR MlLLlNG VARIABLE GROOVES 1N SCREW-DIES.

SPECIFICATION forming part of Letters Patent No. 602,884, dated April 28, 1898. Application filed ociwber 25, 1897. Serial No. 656,283. (No model.) Patented in Austria July 8, 1895,1io'. 58,188-

To all whom it may concern.-

Be it known that I, ANTON URBAN, a citizen of Austria, residing at Vienna, Austria- Hungary, have invented certain new and useful Improvements in Machines for Milling Variable Grooves in Screw-Dies, (for which I obtained LettersP-atent in Austria July 8, 1895, No. 58,188,) of which the following is a specification.

My invention relates to improvements in machines for milling variable grooves in dies for rolling screwethreads or in other tools or articles; and the objects of my improvement are simplicity and economy in construction and convenience and efficiency in operation, especially with reference to the more perfect formation of the grooves.

In the accompanying drawings, Figure 1 is a front elevation of my machine and a dieblock with the cutter at the first end of the die-block. Fig. 2is a like view with the cutter in an elevated position at the last end of the die-block, said die-block being shown in sectionl Fig. 3 is a plan view of the main parts of said machine with the cutter in the position shown in Fig. 1. Fig. 4 is a like view of the same with the parts in the position shown in Fig. 2. Fig. 5 is a detached end view of a die-block, one or both broad sides of which may be milled in. my machine to make a die for rolling screw-threads. Fig. 6 is an enlarged detached plan view of the cutter, together with a portion of a groove made to correspond with the profile of the cutter. Fig. 7 is a transverse section of aportion of a die-block with grooves corresponding in profile to the cutter. Fig. 8 is a plan View of the cutter, together with a portion of a groove made by said cutter, but unlike the cutter in profile. Fig. 9 is a transverse section of a portion of a die-block with grooves like that in Fig. 8. Fig. 10 isv a front elevation, on the same scale as Fig. 1, of my machine in a modified form,whereby the cutter instead of the die-block carriage is made to swing to vary the profile of the grooves milled by the machine. Fig. llis asectional plan view of the same, the main port-ions only of the frame being shown in section, while minor portions of the frame are omitted. Fig. 12 is a sectional view of the main frame, together with a plan view of the swinging frame for the cutter. Fig. 13 is a side elevation of the machine, showing the left-hand side of Fig. 11. Fig. 14: is an enlarged sectional plan of one form of roller for acting on a straight incline or cam. Fig. 15 is a like View of a guide-finger to be substituted for the roller, Fig. 14, for use in connection with a wavy cam or carriage-guide- Fig. 16 is a sectional side elevation of a modification of the parts for raising the cutter, the scale being the same as in Fig. 1. Fig. 17 is a front elevation of the same. Fig. 18 is a plan View of the principal parts of the machine in a form specially'adapted for milling grooves with a series of reverse tapers. Fig. 19 is a sectional front elevation of the machine in a form specially adapted for milling tapering grooves in a cylindrical instead of a straight surface as, for example, in rollerdies. Fig. 20 is a sectional side elevation of the same. Fig. 21 is a sectional plan view of parts of the same. Fig. 22 is a like view of a portion of the same with the parts in a different position. Fig. 23 is a plan view of the frame for supporting the spindle that carries the roller-die to be milled. Fig. 24 is a detailed view of the rotary feed for slowly rotating the roller-die while being milled. Fig. 25 is a sectional side elevation of the means for depressing the roller-die. Fig. 26 is a front elevation of the same. Fig. 27 is a side elevation of the mechanism for swinging the carriage to change the relative position of the axes of the cutter and the roller-die, and Fig. 28 is a detailed view of the longitudinal feed for moving the roller-die in the direction of its axis while being milled.

A designates a frame of the machine, the remainder of said frame not being shown, as its shape below the bed-line or surface 29 is wholly immaterial.

B designates a supplemental frame of any desired form, upon which is mounted to slide up and down in suitable guides the cutter carriage or frame 0. A stop-lug 80 on the frame B projects into a hole 31 in the cutterframe 0, and on the front of said cutter-frame is a set-screw 82, the end of which may bear on the upper side of the stop-lug 30, as shown portion of the bed or main in Fig. 1, thereby regulating or adjusting the drop of the cutter-frame. Said cutter-frame has mounted within it the cutter-spindle 33, carrying the driving-pulley 34, conical roller 85, and cutter or milling-tool 36.

The die-carriage bed 37is mounted to swing on a swiveling or pivoted standard 38 of any suitable construction that will permit it to turn freely. The axis of this standard is in the same vertical plane as the axis of the cutter-spindle 33, while the cutter 36 should be so set as to have its sharp edge in the same vertical plane as the axis of the standard. In other words, the vertical planes in which the axis of the cutter-spindle and the edge of the cutter lie should meet each other in the line of the axis of the standard. Said bed is provided with suitable longitudinal ways, upon Q which the die-carriage 39 is mounted for moviug longitudinally. One side edge of the diecarriage 39 carries a wedge or cam 48, the edge of which bears upon a guide, preferably in the form of a friction-roller 40, properly mounted on the frame or other fixed support.

A cord or chain 41, attached by one end to one end of the die-bed, passes over a roller 42 5 and has a weight 43 secured to its other end, whereby said weight has a constant tendency pressed firmly i The die-car-1 riage is also provided with a suitable die-j holder 44 of any ordinary form, and on said 5' An ordinary 5 form of die-block 46 is represented as held in place on the die-holder 44, the particular man- I ner of holding the die-block being immaterial. The die-block is shown separately in Fig. 5 1 and is provided near one edge on both sides 1 with a ledge or rib 47, this being the ordito keep the wedge or cam against the friction-roller 40.

die-holder is the guide-rail 45.

nary form of double-faced die for rolling threads on gimlet-pointed screws.

cline I have shown the die-holder and dieblock as set at an angle to the length of the In Fig. 3 the middle line of the die-carriage. grooves in the die is parallel to the longitudinal movement of the die-carriage and at a right angle to the axis of the cutter. WVhen in this position, the groove cut or milled will have a profile that corresponds with the profile of the cutter. In ordinary machines for milling the grooves in similar dies there is a feed mechanism to feed the die-carriage along under the cutter and also mechanism for moving the die-holder and die-block transversely on the die-carriage after cutting each groove preparatory to cutting the next succeeding groove. I consider it unnecessary to show such mechanism, as the carriage may be fed and the die-block moved for each succeeding groove in any ordinary manner.

Figs. 1 and 3 show the cutter at the first end of the die-block, where the axis of the cutter is at a right angle to the line of the groove, whereby the grooves at that end will be V- shaped and of the same profile as the cutter, as shown in Figs. 6 and 7. As the die- Inasmuch as the grooves through the die run on an incarriage is fed along, the wedge or cam 48, acting on the roller 40, gradually swings the carriage on its vertical axis and constantly changes the angle that the die-carriage stands to the cutter-axis, and consequently the cutter itself stands at an angle to the line of the groove being cut, whereby the groove is of a profile that is unlike that of the cutter, as shown in Figs. 8 and 9. With a straightedged wedge or cam 48 the change in the shape of the groove is gradual, the groove growing wider, so as to form the wedge-shaped grooves when seen inplan View, as shown in Figs. 3 and 4. The guide-rail 45 and conical roller 35 are so related to each other and the dieblock that as the cutter reaches the rib or ledge 47 said guide-rail and roller act to gradually raise the cutter-frame and carry the cutter properly over said rib and groove that portion of the die as well as the fiat face. Figs. 2 and 4 show the machine with the cutter at the last end of the groove and thus raised.

Figs. 10, 11, 12, and 13 relate to a machine for doing'the same work in the same way; but instead of swinging the work to vary the angle of the cutter to the line of the groove I swing the cutter for the same purpose. The cutter also rises and falls, as before described.

299, Figs. 10 and 13, designates the bed-line or table-surface, upon which the other parts are mounted.

D is the standard, having a vertical shaft 49, upon which the cutter-frame 50 is mounted to rise and fall and also to swing horizontally. Said frame is provided with the cutter-spindle 33, carrying the beveled gear 51, conical roller 35, and cutter 36. The die-carriage bed 37 is the same as before excepting that it is mounted in a fixed position instead of on the pivotal standard. The die-carriage and parts mounted thereon are the same as before described. The cutter-spindle is driven and the die-carriage is fed by means of the tubular shaft 52, carrying a driving-pulley 53 and screw gear-wheel 54. Within this tubular shaft is a sliding shaft 55, fitted to slide freely therein in the longitudinal direction, but pro.- vided with a spline or equivalent device to necessitate its rotation with the tubular shaft 52. The cutter-frame is provided with a short shaft 67 at right angles to the cutter-spindle, and on said shaft is a beveled gear-wheel 68, that engages and drives the beveled gearwheel 51 of the cutter-spindle. The shafts 55 and 67 are connected so as to rotate together by the shaft-section 69 and universal joints 56. The screw gear-wheel 54 of the tubular shaft 52 engages with and drives a like screw gear-wheel 70 at right angles thereto, (said wheel 7 0 being indicated only by broken lines in Fig. 13,) which wheel 70 is on the shaft 57, carrying a worm or screw that engages and drives the wormwheel 58 on the ordinary feedscrew 59 of the die-carriage. Upon one side of the swinging cutter-frame is a straight face 60, and upon a fixed standard 61 there is an angle-lever 62, one end of which carries a ed in any ordinary manner.

roller 63 for bearing against the wedge or cam 48, while the other end of said angle-arm bears against the said straight face 60 on the cutterframe. A cord or chain 64 has one end se cured to the cutter-frame, passes over a pulley 65, and has at its other end a weight 66, Fig. 13, whereby the cutter-frame is always pressed against the edge of the wedge or cam 48. A stop set-screw 71, Fig. 11, in a fixed standard 72 is employed to limit the swinging movement of the cutter-frame 50 in the direction that it is moved by the weight whenever the cam or wedge 48 does not act to so limit said movement. The operation is precisely the same as previously described, only the cutter-frame, instead of the die-carriage and work, swings to make the desired variation in the angle of the cutter-shaft to the line of the grooves being cut. The sliding shaft 55 and the universal joints and shaft-section between it and the beveled gears on the cutter-frame permit the cutter-frame to thus swing and also to rise and fall without interfering with the rotary movement of the cutter.

The friction-roller 40, Figs. 2 and 3, for bearing on the wedge or cam 48 may be mount- I prefer to provide its forked head 73 with a shank 74, that may be held in a suitable socket 75, Fig. 14, by a set-screw 76. A rounded nose may be substituted in the same construction whenever a wavy or irregularly-facedcam i8 is employed, as shown in Fig. 15.

In Figs. 16 and 17 the cutter-frame C is modified sufficiently to mount the conical roller 35 above instead of on the cutter-shaft, and in connection therewith I employ on the die-holder 44 a slotted guide-rail 45- with the cutter-spindle extending through the slot therein. The slot in the guide-rail is long enough and wide enough to permit of the necessary movements of the die-holder and of the cutter-shaft.

Fig. 18 shows substantially the same construction as in Figs. 1 to at, only the wedge or cam 48 has a wavy curved bearing-face in stead of a straight face, and I have also shown the mechanism for driving the feed-screw 59. Said feeding mechanism is applicable to the machine of Figsl to 4. It consists ofatubular shaft mounted in suitable bearings 77, upon which is mounted the step-pulley 78 and pulley 79. YVithin the tubular shaft is the sliding shaft 80,thesame being fitted to rotate with the step-pulley, but allowed to slide freely independently of the same. A shaft-section 69 is connected by means of universal joints 56 with the sliding shaft 80 and the worm-shaft 81, that drives the worm-gear 58 of the feedscrew 59. The operation of this machine is p the same as that of Figs. 1 tot, excepting that by reason of the wavy bearing-face of the wedge or cam 48 the grooves of the die-block 46* taper in reverse directions in sections corresponding with the waves of the cam.

My invention is also applicable to milling riage-bed 37 has mounted on suitable ways the first or lower, carriage 39, and on suitable ways the second die-carriage 399 is mounted to slide parallel to the length of the said first carriage. Upon the carriage-bed 37 is a feed-screw 84, (see Fig. 19,) secured against longitudinal movement in any ordinary manner and extending'through the nut of said carriage, as in ordinary feed-screws. Said feed-screw is provided with a toothed division-wheel or gear-wheel 86 and handle 87 for turning said feed-screw when desired, and on the'carriage-bed is a slide or pawl 88 for engaging the teeth of the division-wheel and holding it against rotation. The said first carriage 39 has mounted on it in like manner a similar feed screw 89, that passes through a like nut 90 on the under side of the second die-carriage 399, the end of which screw is provided with a worm-wheel 91. A bracket 92 is secured to the left-hand end, as shown in Fig. 19, and in said bracket the worm 93 for engaging the worm-wheel 91 is journaled. The die or roller block 46 to be grooved is mounted upon a spindle 94 in a frame 95, and this roller or die holding frame 95 is secured by a screw 96 to the second diecarriage, said screw being concentric with the vertical shaft 82. The axis of said shaft and screw is located relatively to the cutter in the manner before described for the axis of the die-carriage bed 37 and its standard 38. The said frame 95 is further secured to the second die-carriage by bolts or screws 100, passing through slots 101, Fig. :23, whereby the said frame may be set parallel with the diecarriages, as shown in Figs. 21 and 22, or at an angle thereto, as shown in Fig. 23. The die-roller spindle 94' has mounted upon it a stop disk or roller 97, the edge of which bears against the stop rail or guide 98 on the frame of'the machine and serves to limit the upward movement of the vertical shaft 82 and parts mounted thereon as they are forced upwardly by the weighted lever 83. The stop rail or guide is also provided with a ledge 99, and the function of said ledge and stop-disk is the same as that of the conical rollers and guide-rails before described-viz., to move the cutter and die away from each other when the cutter passes over the ledge 47 of the straight die 46 in the construction first described and to move the roller die-block 46 down when its corresponding ledge 47 is passing under the cutter in the construction shown in Fig. 19. The said die-roller spindle 94 has also mounted on it a worm-wheel 102 and a cam 103, a side View of which is shown in Fig. 27. The cam bears against the friction-roller 104 in a bracket 105, that is mounted on the main frame. The cam is kept in contact with the roller by means of the cord 106 and Weight 107, one end of the cord being secured to the swinging die-carriage bed, as before described.

The main driving-shaft 108 is best shown in Fig. 21, and it carries two screw gear-wheels 109 and 110, the former of which engages a like screw gear-wheel 111. Said wheel 111 drives a sliding shaft 112, Figs. 21 and 24, that is connected by the shaft-section 69 and universal joints 56 to the worm 113, that is mounted on the frame 95 and drives the wormwheel 102.

The screw gear-Wheel 110 on the shaft 108 engages a like screw gear-wheel 114, Fig. 28, which drives a sliding shaft 115, connected by shaft-section 69 and universal joints 56 with the worm-gear 93, that drives the worm gear-wheel 91 on the first die-carriage.

In operating this machine the feed-screw 84 moves the first die-carriage 39 and all of the parts that are mounted thereon. This may be used to bring the roller-die 46 into the proper position for starting a groove or grooves. The worm 113, acting on the wormwheel 102, rotates the roller-die spindle 94 to carry the surface of the die along under the cutter and also to rotate the cam 103. This rotary movement of the die-spindle corresponds with the longitudinal movement of the die-holder 44, first described, while the cam 103 serves the purpose of the cam or wedge 48 to change the relative angle of the axis of the cutter-spindle to the line of the grooves. Figs. 21 and 22 show the parts in two different positions as thus moved by the said cam. The worm 93, acting on the worm-wheel 91, rotates the feed-screw S9 for feeding the carriage 399 on the first carriage 39, thereby moving the die-holder spindle 94 longitudinally with a slow motion to determine the angle of the grooves. This feed performs the same office in this form of machine as does setting the die-block at an angle to the line of its movement in the form of machine first described. When the stop-disk 97 is acted on by the ledge 99 of the guide-rail 98, the carriage 39 and all parts carried thereby are depressed to permit the cutter to pass the ledge 47 a of the roller die-block 46 The particular driving mechanisms, with their shaftsections and universal joints, permit of the movements hereinbefore described, notwithstanding the changing positions of the parts being driven.

It is apparent that in carrying out my invention some changes from the constructions herein shown and described may be made. In fact, I have shown several of such changes in my Austrian Patent of July 8, 1895. I would therefore have it understood that I do not limit myself to the exact form shown, but hold myself at liberty to make such changes and alterations as may fairly fall within the spiritand scope of my invention.

I claim as my invention 1. The combination of' a cutter-spindle and cutter mounted thereon for milling grooves, a carriage for holding the work to be milled, means for moving the carriage along relatively to the cutter and means for holding the cutter-shaft and middle line of the groove being milled at progressively-varying angles as the carriage is fed along, substantially as described.

2. The combination of a cutter-spindle and cutter mounted thereon, with a work-holding carriage, and an axis or pivot upon which the carriage and cutter-spindle may swing relatively to each other to change the angle of the cutter-spindle to the line of the grooves out thereby, the said axis being in alinement with the junction of the spindle-axis and the edge of the cutter, substantially as described.

3. The combination of a cutter-spindle,and cutter mounted thereon with a work-holding carriage, an axis or pivot upon which the carriage and cutter-spindle may swing relatively to each other to change the angle of the cutter-spindle to the line of cut, and means for governing the distance between the axis of the cutter and surface of the die-block, substantially as described.

4. The combination of a cutter-spindle and cutter with a work-holding carriage,.feeding mechanism for said carriage, an axis or pivot upon which the carriage and cutter-spindle may swing relatively to each other to change the angle of the cutter-spindle to the line of out, driving mechanism for the cutter-spindle and feed, and flexible and sliding connections with the driving mechanism for the swinging member, substantially as described.

5. The combination of a cutter-frame, a cutter-spindle and cutter mounted thereon, a diecarriage bed mounted to swing on an axis which extends at right angles to the axis of the cutter spindle, a carriage mounted to slide on said bed, a cam 0r wedge mounted on said carriage and a device engaging said wedge to govern the swinging movement of the carrier as it passes along under the cutter, substantially as described.

6. The combination of a cutter-frame, a cutter-spindle and cutter mounted thereon, a swinging carriage-bed, a carriage mounted to slide on said bed, feeding devices for feeding the carriage along on its bed, means for swin ging the bed and carriage as the carriage is fed along, and a flexible and sliding connection between the feeding devices of the carriage and the pulley where the power is applied, substantially as described.

7. The combination of a cutter-frame, a cutter-spindle and cutter mounted thereon, a diecarriage bed mounted to swing on an axis which extends at right angles to the axis of the cutter spindle, a carriage mounted to 10 that is perpendicular to that of the cutterspindle, the die-carriage mounted to slide on said bed, the cam or Wedge mounted on said carriage, and a device for hearing on the face of said Wedge or cam for swinging the bed andvean'iage on their axis, substantially as 15 described.

ANTON URBAN. Witnesses:

VIoToR SANTERRE, EDWARD HAMPEL. 

